Game automatically loses before the timer starts - Unity Answers
How to create a timer - Unity - YouTube
How to make a timer and health bar transition between scenes using a game manager? - Unity Answers
GitHub - TheShroom/Simple-Timer-for-Unity: A simple script made in C# for Unity which allows you to create timed events. Mainly uploaded here as permanent storage for myself, but feel free to use. :D
Creating a timer | Unity 2020 By Example - Third Edition